A lot of the time you may not need an undersuit. Because the dryusit is water and wind proof, trousers and perhaps a sweatshire will be adequate.
But for long periods in cold water, you will need something warmer.
Polar Bears have been making undersuits since 1982.
Our first was the one-piece fur pile suit which has come to be known as the 'Woolly Bear'. It is still a big seller and the first choice for many water rescue professionals.
Our range includes one-piece fleeces, two-part thermal layers and nylon/fur undersuits.